I try to retrieve data using the sendandload() method of a Loadvars Object

First question :

Is it a problem if the response data does not look like this : "attribute=value&attribute2=value2..." (it looks like this : {"result":{"uid":"24947431041778945007157724608309","sid":"20825068196 030559827758762683967"}} )

Second Question :

If it is not possible to get the data this way, would it be a good idea to do a Php script to retrieve the data and then format it ?